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 A278244 Least number with the prime signature of the n-th centered square number (A001844(n)). 2
 1, 2, 2, 4, 2, 2, 6, 2, 6, 2, 6, 6, 2, 6, 2, 6, 6, 2, 6, 2, 4, 12, 2, 30, 2, 2, 6, 6, 24, 2, 2, 6, 2, 6, 2, 2, 30, 6, 6, 2, 6, 30, 2, 6, 6, 6, 12, 2, 6, 12, 2, 6, 6, 12, 6, 6, 6, 6, 12, 6, 2, 30, 6, 6, 6, 2, 30, 6, 6, 2, 2, 12, 2, 6, 6, 6, 6, 6, 60, 2, 6, 6, 2, 6, 2, 2, 30, 2, 30, 6, 2, 30, 6, 30, 6, 30, 24, 2, 6, 2, 2, 30, 2, 12, 2, 6, 30, 6, 30, 2, 2, 6, 6, 6, 6 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS Antti Karttunen, Table of n, a(n) for n = 0..10000 FORMULA a(n) = A046523(A001844(n)). PROG (PARI) A046523(n) = my(f=vecsort(factor(n)[, 2], , 4), p); prod(i=1, #f, (p=nextprime(p+1))^f[i]) \\ From Charles R Greathouse IV, Aug 17 2011 A001844(n) = 2*((n^2) + n) + 1; A278244(n) = A046523(A001844(n)); for(n=0, 10000, write("b278244.txt", n, " ", A278244(n))); (Scheme) (define (A278244 n) (A046523 (A001844 n))) CROSSREFS Cf. A001844, A046523. Cf. also A278162, A278254, A278259. Sequence in context: A175462 A133946 A286250 * A278542 A033722 A320166 Adjacent sequences:  A278241 A278242 A278243 * A278245 A278246 A278247 KEYWORD nonn AUTHOR Antti Karttunen, Nov 22 2016 STATUS approved

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Last modified September 19 17:35 EDT 2021. Contains 347564 sequences. (Running on oeis4.)